Theoretical Study of Electrical Resistivity in Actinide Metals

Takaoka, Y.; Moriya, Tôru

doi:10.1143/jpsj.52.605

Cited by 6 publications

(4 citation statements)

References 9 publications

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“…This characteristic feature is similar to those observed in some actinide metals and compounds [12]. This was explained by the effect of the narrow energy band near the Fermi energy from the theoretical point of views [13,14]. The present result suggests the narrow quasiparticle band of the 4f electrons near the Fermi energy in the Pr-IV phase.…”

Section: Resultssupporting

confidence: 90%

Pressure-induced valence change in the rare earth metals: The case of praseodymium

Tateiwa¹,

Nakagawa²,

Fujio³

et al. 2006

Journal of Alloys and Compounds

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The rare earth metal praseodymium (Pr) transforms from the d-fcc crystal structure (Pr-III) to ␣-U one (Pr-IV) at 20 GPa with a large volume collapse ( V/V = 0.16), which is associated with the valence change of the Pr ion. The two 4f electrons in the Pr ion is supposed to be itinerant in the Pr-IV phase. In order to investigate the electronic state of the phase IV, we performed the high-pressure electrical resistance measurement using the diamond anvil cell up to 32 GPa. In the Pr-IV phase, the temperature dependence of the resistance shows an upward negative curvature, which is similar to the itinerant 5f electron system in actinide metals and compounds. This suggests the narrow quasiparticle band of the 4f electrons near the Fermi energy. A new phase boundary is found at T 0 in the Pr-IV phase. From the temperature and magnetic field dependences of the resistance at 26 GPa, the ground state of the Pr-IV phase is suggested to be magnetic. Several possibilities for the origin of T 0 are discussed.

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Section: Resultssupporting

confidence: 90%

Pressure-induced valence change in the rare earth metals: The case of praseodymium

Tateiwa¹,

Nakagawa²,

Fujio³

et al. 2006

Journal of Alloys and Compounds

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“…[6,8] Three of these reagents are commercially available: 1,1,2,2tetrafluoro-N,N-dimethylethan-1-amine (1A; TFEDMA, Petrov reagent), [9] 2-chloro-N,N-diethyl-1,1,2-trifluoroethan-1-amine (1B; Yarovenko reagent), [10] and N,N-diethyl-1,1,2,3,3,3-hexafluoropropan-1-amine (1C; Ishikawa reagent). [11] In addition, we have developed a new FAR 1D, which shows similar reactivity to TFEDMA (1A), and was used for the introduction of the -CHFOCF 3 group (Figure 1). [8d,8f ] In this paper, we describe the synthesis of new 2,4-bis(fluoroalkyl)quinolines substituted at the aforementioned interesting C-3 position, in an effort to introduce chemical diversity.…”

Section: Introductionmentioning

confidence: 99%

2,4‐Bis(fluoroalkyl)quinoline‐3‐carboxylates as Tools for the Development of Potential Agrochemical Ingredients

et al. 2018

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Based on an easy and scalable method for the synthesis of quinoline derivatives substituted by fluorinated groups at both the C‐2 and C‐4 positions developed in our laboratory, we have devised an approach to the synthesis of a new series of unprecedented 2,4‐bis(fluoroalkyl)quinoline‐3‐carboxylates in just two steps. After standard saponification, the latter gave the corresponding 2,4‐bis(fluoroalkyl)quinoline‐3‐carboxylic acids, which served as pivotal intermediates for post‐functionalization reactions. Indeed, the carboxylic group could then be derivatized according to known procedures to introduce chemical diversity at the C‐3 position of these unprecedented structures. The resulting highly functionalized quinolines can serve as a platform for the development of biologically active molecules with strong potential for agrochemical research.

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“…This general approach was demonstrated by using three different FARs: 1,1,2,2-tetrafluoro-N,N-dimethylethan-1amine (TFEDMA, 1a), N,N-diethyl-2-chloro-1,1,2-tri-fluoroethan-1-amine (Yarovenko reagent, 1b), and N,N-diethyl-1,1,2,3,3,3-hexafluoropropan-1-amine (Ishikawa reagent, 1c). [45][46][47] These FARs are prepared from commercially available bulk fluoroolefins (chemicals frequently employed for polymers) and dimethyl-or diethylamine. C. Wakselman reported in 1975 on their use as a difluoroacyl transfer reagent on highly electron-rich aromatic substrates.…”

Section: Introductionmentioning

confidence: 99%

“…[48] Generally, these reagents are used as replacements of OH by F in alcohols and carboxylic acids. [49][50][51][52]46,53] Very recently, we became interested in their use as building blocks for the introduction of fluorinated functionalities. [42,43] The key aspect of this methodology relies on the negative hyperconjugation between the lone pairs at nitrogen of the amino group and the adjacent difluoromethylene group.…”

Section: Introductionmentioning

confidence: 99%

A General Approach towards NH‐Pyrazoles That Bear Diverse Fluoroalkyl Groups by Means of Fluorinated Iminium Salts

et al. 2015

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A new and general approach to important fluoroalkyl-substituted pyrazoles has been developed. The approach is based on the use of fluoroalkyl amino reagents and their Lewis acid activation to form a fluoroalkyl iminium salt that acts as a formal "fluoroacyl transfer reagent". Their interaction with readily available fluoroalkyl azines followed by spontaneous cyclization of the formed intermediates under acidic condi-

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Theoretical Study of Electrical Resistivity in Actinide Metals

Cited by 6 publications

References 9 publications

Pressure-induced valence change in the rare earth metals: The case of praseodymium

Pressure-induced valence change in the rare earth metals: The case of praseodymium

2,4‐Bis(fluoroalkyl)quinoline‐3‐carboxylates as Tools for the Development of Potential Agrochemical Ingredients

A General Approach towards NH‐Pyrazoles That Bear Diverse Fluoroalkyl Groups by Means of Fluorinated Iminium Salts

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Theoretical Study of Electrical Resistivity in Actinide Metals

Cited by 6 publications

References 9 publications

Pressure-induced valence change in the rare earth metals: The case of praseodymium

Pressure-induced valence change in the rare earth metals: The case of praseodymium

2,4‐Bis(fluoroalkyl)quinoline‐3‐carboxylates as Tools for the Development of Potential Agrochemical Ingredients

A General Approach towards NH‐Pyr­azoles That Bear Diverse Fluoroalkyl Groups by Means of Fluorinated Iminium Salts

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A General Approach towards NH‐Pyrazoles That Bear Diverse Fluoroalkyl Groups by Means of Fluorinated Iminium Salts